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Bug #75855 DateTime::diff class does not take into account microseconds in some cases
Submitted: 2018-01-21 19:33 UTC Modified: 2021-04-06 18:23 UTC
Avg. Score:4.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: marcospassos dot com at gmail dot com Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 7.2.2RC1 OS:
Private report: No CVE-ID: None
 [2018-01-21 19:33 UTC] marcospassos dot com at gmail dot com
The method DateTime::diff() of the native DateTime class does not take into account microseconds, as explained below.

Start: 2015-08-31 00:00:00.000001
End: 2015-09-01 00:00:00.000000

The diff object returned by the method DateTime::diff() for these dates reports that a whole day has been elapsed since the start date. As evidenced, such result is wrong since 1 microsecond is missing in the interval to complete a full day.

In an addition, the result of the number of microseconds is expected to be positive, as all the units do. However, in this case, the result is negative.

Test script:

Expected result:
Years: 0
Days: 0
Total days: 0
Months: 0
Hours: 0
Minutes: 0
Seconds: 0
Microseconds: 1.0E-6

Actual result:
Years: 0
Days: 1
Total days: 1
Months: 0
Hours: 0
Minutes: 0
Seconds: 0
Microseconds: 1.0E-6


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 [2021-04-06 18:23 UTC]
-Status: Open +Status: Not a bug
 [2021-04-06 18:23 UTC]
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Looks from the 3v4l link that that got fixed in 7.2.12 already.
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